So other than your regular swt or swing, what gui library do you use?
Do you also use xml-based gui like http://xmlgui.tigris.org/ and http://jgb.sourceforge.net/index.php ? I haven't looked closer, but it says that they don't support all swing's widget; will it be worth it?
How Eclipse ( http://eclipse.org ) implemented theirs? It looks so appealing.